package com.heima.app.gateway.filter;

import com.heima.utils.common.AppJwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Component
@Slf4j
public class AuthorizeFilter implements Ordered, GlobalFilter {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //1.获取request和response对象
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();

        //2.判断是否放行
        if (request.getURI().getPath().contains("/login")) {
            //放行
            return chain.filter(exchange);

        }

        //3 获取token
        String token = request.getHeaders().getFirst("token");
       //4 判断token是否存在
        if(StringUtils.isBlank(token)){
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        try {
            //5 判断token是否有效

            Claims claimsBody = AppJwtUtil.getClaimsBody(token);
            int result = AppJwtUtil.verifyToken(claimsBody);
            //1 或2 代表token验证不成功
            if(result==1||result==2){
                response.setStatusCode(HttpStatus.UNAUTHORIZED);
                return response.setComplete();
            }

            //获取token中的id
            Long id = claimsBody.get("id", Long.class);
            if(id==null||id==0){
                response.setStatusCode(HttpStatus.UNAUTHORIZED);
                return response.setComplete();
            }

            //把用户id送到下游服务
            ServerHttpRequest serverHttpRequest = request.mutate().headers(httpHeaders -> httpHeaders.add("userId", id + "")).build();
            ServerWebExchange webExchange = exchange.mutate().request(serverHttpRequest).build();

            return chain.filter(webExchange);
        } catch (Exception e) {
            e.printStackTrace();

        }
        return chain.filter(exchange);
    }


    /**
     * 优先级设置  值越小  优先级越高
     * @return
     */
    @Override
    public int getOrder() {
        return 0;
    }
}
